Why is __delay_ms (2500) not exactly 2.5s on 16F877A ?

[bianchi77]

Guys,

Why is __delay_ms (2500) not exactly 2.5s on 16F877A ?
and after few loops , why is it freezing ?
Something wrong with my clock and configuration ?

thanks

 

[Jinzpaul4u]

Hi Friend,

Inbuilt delay might vary based on your clock and oscillator settings. Have you tried with any other time delay value?

 

[bianchi77]

Hi Friend,

Inbuilt delay might vary based on your clock and oscillator settings. Have you tried with any other time delay value?

How can I configure my oscilator setting ?
thanks

 

[Jinzpaul4u]

Hi there,

This is a sample inbuilt configuration setting example. I am recommending you to please refer PIC16F877A main datasheet(Clock and configuration setting section).

#define _XTAL_FREQ 4000000

__CONFIG(INTCLK & WDTDIS & PWRTDIS & MCLRDIS & UNPROTECT & DUNPROTECT & BORDIS & IESODIS & FCMDIS & LVPDIS);
__CONFIG(BORV40);


Please go through it.

https://www.edaboard.com/threads/210298/

 

[very question]

Hi friend
I invite you to use timer for make exact delay